Grinding wheel truing apparatus



Sept. 23, 1952 c. G. FLYGARE. ET AL 2,611,355

GRINDING WHEEL TRUING APPARATUS Filed Sept. 8, 1950 4 Shee'gs-Sheet l InvenTors EARL E. FLYGARE RAYMUNIl-D. ELL/SUN 5.9.8511. Afforney Sept. 23, 1952 c. G. FLYG'ARE ET AL GRINDING WHEEL TRUING APPARATUS 4 Sheet-Sheet 2 Filed Sept. 8, 1950 M \QNQ Nm .8. mm

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mm Qh m InvenTors CARL E. FLYE'AR'E RAYMUNL' .U. ELL/SUN Mm.

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A Ff) By Patented Sept. 23, 1952 GRINDING WHEEL TRUING APPARATUS Carl G. Flygare and Raymond D. Ellison, Worcester, Mass.,

assignors to Norton Company,

Worcester, Mass., a corporation of Massachusetts Application September 8, 1950, Serial No. 183,688

The invention relates to grinding machines and more particularly to a grinding wheel truing apparatus for truing a predetermined form or shape on the operative face of a grinding wheel.

One object of the invention is to provide a simple and thoroughly practical formed wheel truing apparatus for truing a predetermined form or shape ona grinding wheel. Another object is to provide a truing apparatus in which the truing tool is free to move longitudinally and transversely and governed bya master form or template to generate 'a predetermined contour on the operative face of a grinding wheel. Another object of the invention is to provide a manually operable truing tool support which is arranged to move longitudinally and transversely 2 Claims. (01. 125-11) while a follower is manually maintained in operative engagement with a form or template to generate a predetermined shape on the periphery of a, grinding wheel. A further object of the invention is to provide a truing apparatus having a truing tool holder which is supported for longitudinal and transverse movements relative to the grinding wheel by a plurality of anti-friction rollers to facilitate free movement of the holder to maintain a follower in operative engagement with a master form or template so as to generate a predetermined shape on the periphery of a grinding wheel. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a plan view of the improved grinding wheel truing apparatus;

Fig. 2 is a vertical sectional view, taken approximately on the line 2-2 of Fig. 1, through one of the supporting brackets;

Fig. 3 is a fragmentary sectional view, taken approximately on the line 33 of Fig. 2;

Fig. 4 is a sectional view, on an enlarged scale, taken approximately on the line 4--4 of Fig. 1, showing the truing tool holder together with the supporting carriage and. forming bar; I

Fig.=5 is a fragmentary horizontal sectional view,;takenv approximately on the line 5-5 of 6 is a fragmentary horizontal sectional View, on an enlarged scale,,showing the follower 2 and the truing tool swung in a counterclockwise direction;

Fig. 7 is a similar fragmentary horizontal sectional view, showing the follower and truing tool in central positions;

Fig. 8 is a similar fragmentary horizontal sectional view, showing the follower and the truing tool swung in a clockwise direction;

Fig. 9 is a perspective view of a gage for gaging the shape of the grinding wheel after truing;

Fig. 10 is a sectional view, on an enlarged scale, taken approximately on the line l0l0 of Figs. 1 and 4;

Fig. 11 is a sectional view, on an enlarged scale, taken approximately on the line ll-ll of Figs. 1 and 4; V

Fig. 12 is a sectional view on an enlarged'scale. taken approximately on the line l2l2 of Figs. 1 and 11;

Fig. 13 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line [3-13 of Fig. 12, through one of the anti-friction rollers for supporting the truing toolcarriage;

Fig. 14 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line l4l4 of Figs. 1 and 4;

Fig. 15 is a fragmentary view of apparatus for grinding the follower to a shape identical with that of the truing tool; and

Fig. 16 is a horizontal sectional view taken approximately on the line l6l 6 of Fig. 15, showing the grinding wheel in section and the holder for supporting the follower and truing tool in elevation.

A grinding wheel truing apparatus has been illustrated in the drawings comprising a work table H] which is provided with dove-tailed sur faces H and I2 for supporting a pair of spaced brackets I3 and M. The brackets I3 and I l are provided with clamping blocks [5 and I6 respectively, by means of which the brackets I3 and i4 may be clamped in adjusted position on the table [0.

The clamping arrangement for the brackets l3 and I4 is identical, consequently only one of these arrangements has been shown in detail. This clamping mechanism comprises a rod 11 which extends through a clearance hole I8 within the bracket I3. The lower end of the rod I1 is provided with a nut l9 which is screw threaded onto the end portion thereof. The other end of the rod I1 is provided with a clamping nut 20 and a spacing. washer 21; In orderto facilitate longitudinal movement of the rod H to clamp and release the bracket |3 from the table ID, a hook shaped spacer 22 is pivotally supported by a stud 23 on the bracket IS. The parts as shown in Fig. 2 illustrate the bracket 3 clamped in position on the table N. If it is desired to release the bracket to remove the truing apparatus from the table ID, the clamping nut 20 is loosened, after which the hook shaped spacer 22 is swung in a counterclockwise direction (Fig. 3) after which the rod may be moved longitudinally toward the right so that the clamping block |5 will clear the dovetailed surface l2 of the table E8 to facilitate removing the bracket |3 therefrom. The clamping mechanism for the bracket I4 is identical with that just described and comprises a longitudinally extending rod (not shown) which is provided at its upper end (Fig. 1) with a nut 25. The lower end thereof (Fig. 1) is provided with a clamping nut 26, a washer 21 and a hook-shaped spacer 28.

The brackets l3 and I4 serve as supports for a pair of spaced parallel longitudinally extending slide rods 30 and 3| which serve as a support for a longitudinally movable carriage 32. The carriage 32 is provided with clearance holes 33 and 34 through which the rods 38 and 3| respectively pass. An anti-friction bearing support for the carriage 32 is provided comprising a plurality of anti-friction rollers 35, 35a and 351) which are arranged symmetrically with respect to the clear-- ance hole 53 and the rod 30. These rollers 35, 35a and 35b are supported by studs 36, 33a and 36b respectively. The stud 36b is provided with an eccentric portion 31 by means of which the roller 351) may be adjusted relatively toward and from the rod 30.

A similar set of rollers 40, 48a and 45b are provided on the carriage 32 spaced from the rollers 35, 35a and 35b. The rollers 40, 40a and 40?) are supported by studs 4|, Ma and 4|b. One of the studs 4|, preferably M5, is similarly provided with an eccentric portion (not shown) identical with that shown in connection with the stud 35b to facilitate adjustment of the roller 46?). The two sets of rollers 35, 35a and 35b and 48, 48a and 40b serve as anti-friction. supports for the forward end of the carriage 32 and serve to guide the carriage in a path parallel to the axis ofthe grinding wheel being trued.

Two pair of spaced guiding rolls 45 and 45a and 46 and 46a are arranged in spaced relationship with each other to engage the upper and lower surfaces of the rod 3| to support and steady the left hand end of the carriage 32 (Fig. 4). It will be readily apparent from the foregoing disclosure that the carriage 32 is supported by antifriction rollers, as above described, to provide a free longitudinal movement thereof. The studs 41a and 48a are provided with eccentric portions similar to stud 3617.

A transversely movable slide bar 50 passes through a transversely extending bore 5| formed in the carriage 32. The slide bar 50 is supported by two sets of symmetrically arranged anti-friction rollers 52, 52a and 52b located adjacent to the left hand end of the slide bar 50 and rollers 53, 53a and 531) located adjacent to the right hand end thereof. The rollers 52, 52a and 52b are supported by a plurality of studs 54, 54a. and 547) respectively. The rollers 53, 53a and 53b are similarly supported by a plurality of studs 55, 55a

and, 551). At least one of the studs 54 and 55 is provided with an eccentric similar to that shown in connection with the stud 36b to facilitate adjusting one of the rollers to take up backlash.

4 between the parts so as to provide a free movement of the transversely movable slide bar 50.

A suitable mechanism is provided to prevent rotation of the slide bar 50 during this transverse movement. Portions of the slide bar 50 are cut away to form parallel guide surfaces 60 and 6| (Fig. 14). The carriage 32 is provided with a pair of rollers 62 and 63 which are supported by studs 64 and 65 respectively. One of the studs 64 or 65 is preferably provided with an eccentric portion (not shown) to facilitate adjustment for backlash between the parts. It will be readily apparent from the foregoing disclosure that the rollers 62 and 53 cooperating with the guide surfaces and 6| serve to hold the slide rod 5|) against rotary motion during its transverse movement.

In order to generate a predetermined shape on the operative face of the grinding wheel being trued, a forming bar or template 68 is provided which is fastened to the brackets l3 and H by screws 69, 69a, 69b and 690 (Fig. l). The forming bar 68 passes through an elongated clearance slot 66 formed in the slide bar 50 and also through an elongated clearance slot 61 formed inthe carriage 32 (Fig. 4).

A truing tool is adjustably supported on the right hand end of the slide bar 50 (Fig. 4). The. slide bar 50 is provided with a vertically arranged stud 10 which serves; as a pivotal supportfor a truing tool holder 1| having a. truing tool 12 fixedly mounted therein. The truing tool holder. H is provided with a plurality of conicallyshaped depressions 13, I4 and 15 formed on the upper face thereof. A set screw 16 carried by the slide bar 50 is provided with a conically shaped end which is arranged to engage the depressions 13', I4 and 15 to locate the truing tool holder in predetermined positions for a truing operation. When the truing tool holder is positioned as shown in Figs. 5 and '7, the set screw 16 is in engagement. with the depression 14 to hold the truing. tool 12 in a central position. The truing tool holder may be adjusted either in a counter-clockwise direction into the position illustrated in Fig. 6 or in a clockwise direction into the position illustrated in Fig. 8 by loosening the screw 16 and swivelling the truing tool holder 1| after which the set screw is then tightened to lock the truing tool. holder in adjusted position.

In order to generate a predetermined shape on the periphery of the grinding wheel, a suitable follower mechanism is provided on the slide bar 50. The slide bar 50 is provided with a vertically extending stud 80 the lower end of which is keyed to a follower holder 8| having a follower 82 fixedly mounted thereon. The follower holder 81 is provided with a plurality of V-shaped notches. 83, 84 and 85 the positions of which correspond.

with conically shaped depressions 13, 14 and 15 in the truing tool holder 1|. provided with a slidably mounted detent rod. 86

supported within an axially extending bore 81.

A compression spring 88 (Fig. 4') serves normally to maintain the V-shaped end of thedetent. rod 86 in engagement with one of; the V-shaped. notches 83, B4 or 85. An actuating knob' 89 is mounted on the end of the, detentrod 85 'tofacilitate withdrawing the detent rod to index the.

follower holder 8| when desired. A manually. operable actuating. handle 90 is arranged adjacent to the left hand end of the slide bar- 50 (Fig. 4) to facilitate manual movement of the slide bar 50 to maintainnthe follower 82 in opera: tive engagement with; the: forming bar 68; It W111 The slide bar 50 isbe readily apparent from the foregoing disclosure thatby manipulation of the handle 90, the slide bar 50 may be moved transverselyand the carriage 32 moved longitudinally as permitted by the shape of the forming bar 68 to transmit a predetermined controlled movement t the truing tool I2 so as to duplicate the shape of the master template or forming bar 68 on the operative face of a grinding wheel 92. The stud 80 is provided with an actuating arm 9| to facilitate positioning of the follower holder 8i to correspond with the position of the truing tool holder I I.

As shown in the drawing, the forming bar 08 is shaped to true the operative face of the grinding wheel 92 having two cylindrical portions 92a and 920, a tapered portion 92b, and a radius 92d. The cylindrical portions 92a and 920 of the grinding wheel 92 are preferably trued with'the truing tool holder II located in a central position, that is with the set screw I6 in engagement with the conically shaped depression I4 as shown in Figs. 5.and '7. While truing these portions of the grinding wheel, the follower holder 8I is located. in a central position with the pawl rod 86 in engagement with the V-shaped notch 84. For truing a tapered portion on the wheel such as surface 921), the truing tool holder II is swung in a counterclockwise direction into the position illustrated in Fig. 6 with the set screw I6 in engagement with the conically shaped depression I3. During this truing operation, the follower holder 8I is also swivelled in a counter-clockwise direction so that the pawl rod--86 engages the notch 83. Similarly when it is desired to true a radius portion such) as 92d, the truing tool holder II "is swung in a clockwise direction into the position illustrated in Fig.8 with the set screw I0 engaging the conically shaped depression 15. During this truing operation, the follower holder 8| is also swivelled in a clockwise direction so that the detent rod 80 engages the V-shaped notch 85 to locate the follower 82 in a position to correspond with the truing tool I2.

In order that the follower 82 may transmit an exact corresponding movement to the truing tool I2 in corresponding positions thereof, it is essential that the follower 82 be shaped identical with the shape of the truing tool I2. This is preferably accomplished by setting up the truing tool holder II and the follower holder BI and utilizing the truing tool I2 as a master form to generate an identical shape on the follower 82. This is preferably accomplished by apparatus such as shown in Figs. 15 and 16. A grinding apparatus is provided having a table I00 having an upper plane surface IN. A rotatably mounted grinding wheel I02 is provided having a plane operative face I03. An angle iron I04 is clamped on the table I00 by means of a clamping bolt I05, the head of which is slidably mounted within a T-slot I06 formed in the table I00. The angle iron I04 is provided with a, vertically arranged plane face I0I which is adjusted into alignment with the plane operative face I03 of the grinding wheel I02. A holder I08 is slidably mounted on the upper surface IOI of the table I00. The holder I08 is provided with a horizontally extending boss I09 which supports a vertically arranged spindle H0. The truing tool holder II is arranged to be keyed onto the lower end of the spindle H0 and locked thereon by means of a clamping nut III. The follower holder 8| is arranged to be slidably keyed to the upper end of the spindle H0 and may be clamped thereon by a clamping nut II2 (Fig. 15). The key ways tical shape as the truing tool I2. 7

shaping operation has been performed, the truing I tool holder 1| and the follower holder BI may formed in the truing tool holder H and their IM and maintaining the truing tool I2 in engagement with the surface N1 of the angle iron I04, the follower 82 will be ground to the same idenagain' be mounted in position on the slide bar 50 for a truing operation.

It will be readily apparent from the foregoing disclosure that due to the constructionof this truing apparatus, it is merely necessary for the;

operator to manipulate the handle so as to maintain the follower 82 in operative engagement l and fastened to the brackets I3 and I4 by the screws 09, 09a, 69b and 69a. The brackets I3 q and I4 may then be'adjusted longitudinally on the table I0 to position the shape on the forming bar 68 opposite and in alignment with the operative face of the grinding wheel 92. this positioning movement may be accomplished by a conventional traversing adjustment of the table l0. After the truing apparatus is in the desired position, the clamping nuts 20 and 2B are tightened to lock the brackets I3' and I4 in handle 90 may then be'moved toward the right (Fig. 4) to move the follower 82 into operative Y engagement with the faceof the forming bar 68, after which the grinding wheel may be advanced toward the truing tool I2 by an amount equal to that desired to be trued therefrom. By manipulation of the manually operable handle 90, the slide bar 50 may be moved transversely and the carriage 32 moved longitudinally while maintaining the follower 82 in operative engagement with the forming bar 68 to traverse the truing tool I2 through a predetermined path to true the operative face of the grinding wheel. If desired, the entire traversing movement may be made with the truing tool I2 in a central position, or, if desired, due to the nature of the shape being reproduced, the truing tool holder II may be swivelled in a manner above described to position the truing tool I2 for the truing operation.

It will thus be seen that there has been provided by this invention apparatus in which the objects hereinabove set forth together with many thoroughly practical advantages are-successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim:

1. In a grinding wheel truing apparatus having a frame, a longitudinally movable carriage, anti-friction rollers on said carriage to support After this 1 If desired,

The"

assist? the carriage, a transversely movable cylindricalIy-shapedslide bar on said carriage, 'anti-fric tionrollers on said carriage to support said slide bar, a truing tool holder pivotally mounted on one end of said slide bar, a truing tool thereon, a plurality of spaced index depressions in the upper surface of said truing tool holder, a set screw on said slide bar engageable with one of said depressions to facilitate indexing the-truing tool into one of a plurality of predetermined positions, a follower pivotally mounted on said slide bar in alignment with said truing tool,a pluralityof spaced V-shaped notches formed on said follower holder, said notches being spaced to correspond with the spacing of the. depressions on the truing tool holder, a V-shaped detent slidably mounted on said slide bar for engaging one of the said notches to facilitate positioning the follower precisely in correspondence with the truing tool holder, said follower being shaped identical with said truing tool, a forming bar on said frame having a shape identical with that to be trued on a grinding wheel, and manually opera predetermined shape on the operative face of a grinding wheelr 2. In a grinding wheel truing apparatus having a' pair of spacedsupporting brackets, a pair of parallelspaced slide rods thereon, a longitudinally movable carriage slidablysupported on said rods, anti-friction rollers between said carriage and said rods, a transversely movable slidebar on said carriage, anti-friction rollers between saidslide bar and said carriage, a truing tool holder pivotally mounted on said slide bar, atruing' tool thereon, a plurality of spaced index depressionsin the upper surface of'said truing tool holder, :1 set screw on said slide bar to engage one of said depressions to facilitate locating the truing tool in one of a plurality of positions, a forming bar supported by said brackets having a shape identical with the shape to be trued on a grinding wheel, a follower holder pivotally supported on said slide bar, a follower on said holder which is shaped identically with the truing tool and arranged in axial alignment with the truing tool, a plurality of spaced V-shaped index notches formed on the follower holder, said notches being spaced to correspond with the spacing of the depression on the truing tool holder, a spring pressed v-shaped detent slidably mounted on said slide bar which is maintained in engagement with one of the notches on the follower holder to facilitate positioning the follower precisely in correspondence with the truing tool holder, and a manually operable handle on said slide bar to facilitate a transverse movement of the slide bar and a longitudinal movement of the carriage tomaintain the follower in operative engagement with the forming bar so that the truing tool is moved through a path identical with the shape on the forming bar to true an identical shape on a grinding wheel.

CARL G. FLYGARE. RAYMOND D. ELLISON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1 2,039,455 Studer Apr. 21, 1936- 2,117,979 Ogilvie May 17, 1938 2,184,684 Bickel Dec. 26, 1939 2,187,690 Martin Jan. 16, 1940 2,258,568 Flygare #1 Oct. '7, 1941 2,335,207 Flygare #2 Nov. 23, 1943 2,447,503 Harper Aug. 24, 1948 2,469,365 Braaten May 10, 1949 

